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Quantar Fan's run continuous

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timkilbride

timkilbride

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I recently acquired a Quantar. The SCM and PA fan's run continuous. It is my understanding they should only kick on when the temp rises above a preset level. These fans are still running when the temp is 30F! Is there a internal jumper the previous owner may have messed with?

Thanks

Tim
 
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gesucks

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There was a whole thread on this and the fix on P25.ca before it went away. If you are lucky, someone from that thread will post here
 
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wdatkinson

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I started the aforementioned thread. Unfortunately, it didn't yield any tangible results. I'll see what info I pulled and reshare here. I have two Quantar. One runs as expected the other runs fullbore.

Sent from my SM-T713 using Tapatalk
 
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ThreeD

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I would have to go inside the Quantar to see what the number is, but the fans running continuously is because of a missing jumper. On the PA module, remove the module, remove the cover, and with the backplane connector to the right. There are a series of small resistor jumpers just to the left of the connector. About the 5th one down there is a open connection. A resistor is not really needed, as a jumper will do. Jump the connection and the fans will be back to thermostatically controlled.
 
timkilbride

timkilbride

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ThreeD said:
I would have to go inside the Quantar to see what the number is, but the fans running continuously is because of a missing jumper. On the PA module, remove the module, remove the cover, and with the backplane connector to the right. There are a series of small resistor jumpers just to the left of the connector. About the 5th one down there is a open connection. A resistor is not really needed, as a jumper will do. Jump the connection and the fans will be back to thermostatically controlled.
Click to expand...

Yep, L4123 was empty. Is there something I can do to get the PS fan to be thermostatically controlled?

TIA,

Tim
 
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wdatkinson

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I opened up my PA and sure enough, there was the missing inductor. Funny, I'd opened it before, but those shiny little solder pads just didn't stick out. I used a small piece of wire and jumped the missing component and then did the following:

Re-installed the PA, connected a dummy load and Bird, loaded up RSS and set the channel output to 100W. I then went to the Metering option under Service. Using the option to Key Up, I did so while monitoring the thermistor voltage, output power, as well as the physical temp of the PA fins. I observed the fans to kick on at ~2.4VDC and once de-keyed the fans shut down at ~2.9VDC.

Thank you ThreeD for sharing. This information has remained elusive for quite some time!
 
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